Thermal conductivity improvement of copper-carbon fiber composite by addition of an insulator: Calcium hydroxide

S. Couillaud, Y. F. Lu, J. F. Silvain

Research output: Contribution to conferencePaper

Abstract

The effects of adding calcium hydroxide (Ca(OH)2) to a copper-carbon fiber (30%) composite (Cu-CF(30%)) were studied. After sintering at 700 °C, precipitates of calcium oxide (CaO) were included in the copper matrix. When less than 10% of Ca(OH)2 was added, the thermal conductivity was similar to or higher than the reference composite Cu-CF(30%). A thermal conductivity of 322 W.m-1.K-1 was measured for the Cu-Ca(OH)2(3%)-CF(30%) composite. The effects of heat treatment (400 °C, 600 °C and 1000 °C during 24 hours) on the composite Cu-Ca(OH)2(3%)-CF(30%) were studied. At the lower annealing temperature, CaO inside the matrix migrated to the interface of the copper matrix and the carbon fiber. At 1000 °C, the formation of the interphase calcium carbide (CaC2) at the interface of the copper and carbon fibers was highlighted by TEM observations. Carbide formation at the interface led to a decrease in both thermal conductivity (around 270 W.m-1.K-1) and the coefficient of thermal expansion (CTE (10.1 10-6 K-1)).

Original languageEnglish (US)
StatePublished - Jan 1 2015
Event20th International Conference on Composite Materials, ICCM 2015 - Copenhagen, Denmark
Duration: Jul 19 2015Jul 24 2015

Other

Other20th International Conference on Composite Materials, ICCM 2015
CountryDenmark
CityCopenhagen
Period7/19/157/24/15

Fingerprint

Calcium Hydroxide
Hydrated lime
Carbon fibers
Copper
Thermal conductivity
Composite materials
Lime
Calcium carbide
Thermal expansion
Carbides
Precipitates
Sintering
Heat treatment
Annealing
Transmission electron microscopy
carbon fiber
Temperature
lime

Keywords

  • Calcium hydroxide
  • Carbon fiber
  • Composite materials
  • Copper
  • Interphase
  • Thermal properties

ASJC Scopus subject areas

  • Engineering(all)
  • Ceramics and Composites

Cite this

Couillaud, S., Lu, Y. F., & Silvain, J. F. (2015). Thermal conductivity improvement of copper-carbon fiber composite by addition of an insulator: Calcium hydroxide. Paper presented at 20th International Conference on Composite Materials, ICCM 2015, Copenhagen, Denmark.

Thermal conductivity improvement of copper-carbon fiber composite by addition of an insulator : Calcium hydroxide. / Couillaud, S.; Lu, Y. F.; Silvain, J. F.

2015. Paper presented at 20th International Conference on Composite Materials, ICCM 2015, Copenhagen, Denmark.

Research output: Contribution to conferencePaper

Couillaud, S, Lu, YF & Silvain, JF 2015, 'Thermal conductivity improvement of copper-carbon fiber composite by addition of an insulator: Calcium hydroxide' Paper presented at 20th International Conference on Composite Materials, ICCM 2015, Copenhagen, Denmark, 7/19/15 - 7/24/15, .
Couillaud S, Lu YF, Silvain JF. Thermal conductivity improvement of copper-carbon fiber composite by addition of an insulator: Calcium hydroxide. 2015. Paper presented at 20th International Conference on Composite Materials, ICCM 2015, Copenhagen, Denmark.
Couillaud, S. ; Lu, Y. F. ; Silvain, J. F. / Thermal conductivity improvement of copper-carbon fiber composite by addition of an insulator : Calcium hydroxide. Paper presented at 20th International Conference on Composite Materials, ICCM 2015, Copenhagen, Denmark.
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N2 - The effects of adding calcium hydroxide (Ca(OH)2) to a copper-carbon fiber (30%) composite (Cu-CF(30%)) were studied. After sintering at 700 °C, precipitates of calcium oxide (CaO) were included in the copper matrix. When less than 10% of Ca(OH)2 was added, the thermal conductivity was similar to or higher than the reference composite Cu-CF(30%). A thermal conductivity of 322 W.m-1.K-1 was measured for the Cu-Ca(OH)2(3%)-CF(30%) composite. The effects of heat treatment (400 °C, 600 °C and 1000 °C during 24 hours) on the composite Cu-Ca(OH)2(3%)-CF(30%) were studied. At the lower annealing temperature, CaO inside the matrix migrated to the interface of the copper matrix and the carbon fiber. At 1000 °C, the formation of the interphase calcium carbide (CaC2) at the interface of the copper and carbon fibers was highlighted by TEM observations. Carbide formation at the interface led to a decrease in both thermal conductivity (around 270 W.m-1.K-1) and the coefficient of thermal expansion (CTE (10.1 10-6 K-1)).

AB - The effects of adding calcium hydroxide (Ca(OH)2) to a copper-carbon fiber (30%) composite (Cu-CF(30%)) were studied. After sintering at 700 °C, precipitates of calcium oxide (CaO) were included in the copper matrix. When less than 10% of Ca(OH)2 was added, the thermal conductivity was similar to or higher than the reference composite Cu-CF(30%). A thermal conductivity of 322 W.m-1.K-1 was measured for the Cu-Ca(OH)2(3%)-CF(30%) composite. The effects of heat treatment (400 °C, 600 °C and 1000 °C during 24 hours) on the composite Cu-Ca(OH)2(3%)-CF(30%) were studied. At the lower annealing temperature, CaO inside the matrix migrated to the interface of the copper matrix and the carbon fiber. At 1000 °C, the formation of the interphase calcium carbide (CaC2) at the interface of the copper and carbon fibers was highlighted by TEM observations. Carbide formation at the interface led to a decrease in both thermal conductivity (around 270 W.m-1.K-1) and the coefficient of thermal expansion (CTE (10.1 10-6 K-1)).

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